Test tubes (ii)
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The small size are 100 mm tall x 13 mm with 11 mm inside diameter. Volume is approximately 9 ml. Use No. 00 stopper. (Pack of six.) The large glass test tubes are 150 mm tall x 16 mm with 14 mm inside diameter. Approximate volume is 22 ml. Use with No. 0 stopper. This size is the best for general use. (Pack of two.) The extra-large ones are 150 mm tall x 20 mm with 17 mm inside diameter and approximately 28 ml volume. Use a No. 1 stopper. (Pack of two.) They’re all made of borosilicate glass that’s similar to Pyrex or Kimax. These test tubes can be heated directly in an open flame.